CN111944142B - Organic silicon surfactant, preparation method thereof and polyurethane foam - Google Patents
Organic silicon surfactant, preparation method thereof and polyurethane foam Download PDFInfo
- Publication number
- CN111944142B CN111944142B CN202010903031.3A CN202010903031A CN111944142B CN 111944142 B CN111944142 B CN 111944142B CN 202010903031 A CN202010903031 A CN 202010903031A CN 111944142 B CN111944142 B CN 111944142B
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- foam
- polyurethane foam
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- surfactant
- hydrogen
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- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
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- C—CHEMISTRY; METALLURGY
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- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
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Abstract
The invention provides an organosilicon surfactant which contains a general formula shown in the following formula I-II; where n=16-64, r=c1-3, ph, x=1-25, y=1-10, z=0-20. Polyurethane foam prepared from a foam-forming composition characterized in that the foam composition uses the above-described silicone surfactant. The preparation method of the added organosilicon surfactant of the medium-high density polyurethane foam is simple and easy to implement, and the medium-high density polyurethane foam obtained by adding the organosilicon surfactant into polyurethane has small difference in air permeability between the upper layer and the lower layer, good air permeability and good rebound resilience.
Description
Technical Field
The invention relates to the technical field of organic silicon surfactants, in particular to an organic silicon surfactant, a preparation method thereof and polyurethane foam.
Background
Surfactants (surfactants) are known as "industrial monosodium glutamate" and refer to substances that have immobilized hydrophilic and lipophilic groups, which are oriented on the surface of the solution and which are capable of significantly reducing the surface tension. Surfactants are generally organic amphoteric molecules having hydrophilic and hydrophobic groups, soluble in organic and aqueous solutions. Hydrophilic groups are usually polar groups such as carboxylic acid, sulfonic acid, sulfuric acid, amino or amine groups and salts thereof, and also hydroxyl groups, amide groups, ether linkages, etc.; whereas hydrophobic groups are often nonpolar hydrocarbon chains, such as hydrocarbon chains of more than 8 carbon atoms. Surfactants are classified into ionic surfactants and nonionic surfactants, and the like. The organic compound is a large class of organic compounds, has very special properties, is extremely flexible and wide in application, and has great practical value and theoretical significance.
The organosilicon surfactant is more tightly arranged at a water interface due to the flexibility of a silica chain, so that the organosilicon surfactant has the characteristics of high surface activity, good wetting spreadability, good emulsion stability and the like, has low physiological toxicity, and has been widely applied to the fields of textile, daily chemicals, leather, pesticides and the like as a dispersing agent, a defoaming agent, a softening agent and the like.
Polyurethane foams are generally prepared from a liquid reaction mixture of polyester or polyether polyols, polycyanates, surfactants, catalysts, one or more blowing agents and other auxiliaries which produce gases during polymerization. The gas causes the reaction mixture to foam from forming a cell structure. The surfactant stabilizes the structure of the polyurethane foam. In existing polyurethane technology, silicone surfactants are used to aid and control nucleation sites for polyurethane foam cell formation, to compatibilize chemical components, and to stabilize cells during the formation of polyurethane foam. Flexible polyurethane foams are commercially produced as slabstock or molded foams and continuously produced foams. One block foam was prepared by pouring the mixed reactants into a large box (batch process), while the other foam was prepared by precipitating the reaction mixture on a continuous manner on a conveyor of backing paper. As the conveyor advances, the foam rises and forms, being cut into large pieces as it exits the foam machine. Some applications of flexible sheet polyurethane foam include: pad for home mats, bedding and carpets. Flexible foam formulations typically include, for example: polyols, polyisocyanates, water, optionally foaming agents (low-boiling organic compounds or inert gases such as CO 2), surfactants of the silicone type and catalysts. The flexible foam is generally hollow in structure (opencelled) type materials, while rigid foams generally contain a higher proportion of closed cells. Polyurethane foams are generally prepared by reacting di-or polyisocyanates with compounds containing two or more active hydrogens, optionally in the presence of blowing agents, catalysts, silicone-based surfactants and other auxiliaries. The active hydrogen-containing compounds are typically polyols, primary or secondary polyamines, and water. In the preparation of polyurethane foam, two main reactions, the gel reaction and the foaming reaction, are promoted by the catalyst in the reactants. In order to obtain polyurethane foams with the desired physical properties, these reactions need to be carried out simultaneously and at a competitive equilibrium rate during the process. The reaction between the isocyanate and the polyol or polyamine (commonly referred to as a gel reaction) results in the formation of a high molecular weight polymer. This reaction is dominant in foams that are not blown with low boiling point organic compounds. The reaction proceeds to increase the viscosity of the mixture and generally helps the polyfunctional polyol form crosslinks. The second main reaction is between isocyanate and water. This reaction increases the growth of polyurethane, which is important for generating carbon dioxide gas that promotes foaming. Thus, this reaction is often referred to as a foaming reaction. Historically, many grades of polyurethane foam have been foamed with chlorofluorocarbon (CFC) based blowing agents to reduce foam density, control foam hardness, cool the foam to minimize discoloration, degradation and possible ignition. Environmental problems of ozone depletion associated with specific CFCs have led to the establishment of the montreal protocol. Accordingly, the polyurethane foam industry has attempted to produce foams of the same grade and quality with new all-friendly blowing agents. In flexible foams, many different blowing agents have been evaluated, including alkyl carbonates, acetone, pentane, and the like. Recently, in medium-high density polyurethane foam, an inert gas such as carbon dioxide (CO 2 ) Full water has been used effectively as part of the blowing agent.
Currently, silicone surfactants are used to emulsify, nucleate and stabilize polyurethane foams. This is well known in the literature. Silicone surfactants are now commonly used in a variety of applications, including all pendant ethylene oxide polyether groups (pendants) or all pendant ethylene oxide/propylene oxide groups that react with the silicone copolymer backbone. With the improvement of living standard, the demand of people for comfort is increased, and polyurethane foam with medium and high density is widely produced. However, in the production of high-density flexible polyurethane foam, the degree of crosslinking increases due to the increase in density, and the foam tends to be closed, and the air permeability is poor, and the rebound resilience is poor, which in turn reduces comfort.
Disclosure of Invention
The invention aims to provide an organosilicon surfactant, a preparation method thereof and polyurethane foam, and the organosilicon surfactant can form finer and more uniform medium-high density polyurethane foam, so that the difference between upper and lower layers of polyurethane foam is reduced, the air permeability of the foam is improved, the foaming process is more stable, and the consistency of the quality of each layer of the product is improved. Meanwhile, the obtained medium-high density polyurethane foam has higher aperture ratio, better rebound resilience and more comfort.
The technical scheme of the invention is realized as follows:
the invention provides an organosilicon surfactant which contains a general formula shown in the following formula I-II;
where n=16-64, r=c1-3, ph, x=1-25, y=1-10, z=0-20.
As a further improvement of the invention, the method comprises the following steps:
s1, reacting polyethylene glycol with end group alkenecarboxylic acid to generate an intermediate III with the structure of
R＝C1-3、Ph；
The terminal alkenecarboxylic acid is selected from one of 4-vinylbenzoic acid, 3-butenoic acid, 4-pentenoic acid and 5-hexenoic acid;
s2, reacting the intermediate III with hydrogen-containing siloxane to generate a product organosilicon surfactant;
the hydrogen-containing siloxane is selected from one of double-end hydrogen-containing silicone oil and low hydrogen-containing silicone oil, and the double-end hydrogen-containing silicone oil has a structure shown in a formula IV:
wherein x=1 to 25;
the low-hydrogen silicone oil has a structure shown in the formula V:
where z=0-20 and y=1-10.
As a further improvement of the present invention, the amounts of polyethylene glycol and terminal alkenecarboxylic acid materials described in step S1 are prepared as 1: (2.1-2.5); the molecular weight of the polyethylene glycol is 300-6000.
As a further development of the invention, the ratio of the amounts of intermediate II to the hydrogen-containing siloxane substance in step S2 is (2.1-2.4): 1.
as a further improvement of the invention, the method comprises the following steps:
s1, dissolving 1mol of polyethylene glycol and 0.2-0.5% of isopropyl titanate accounting for the total mass of the system in 200mL (medium density polyethylene) MF, adding NaOH accounting for 1-2% of the total mass of the system, introducing nitrogen for protection, heating to 120-150 ℃, dropwise adding 2.1-2.5mol of end group alkenecarboxylic acid, reacting for 1-3h, filtering, washing with water, and distilling under reduced pressure to obtain an intermediate II;
s2, dissolving 2.1-2.4mol of intermediate II and 1-4% of ethylenediamine accounting for the total mass of the system in 200mL of isopropanol, adding 0.01-0.1% of platinum catalyst accounting for the total mass of the system, adding 1mol of hydrogen-containing siloxane in batches, carrying out reflux reaction for 2-5h, filtering, washing with water, and washing with ethanol to obtain the organosilicon surfactant;
the platinum catalyst is platinum metal net, platinum black or platinum-carrying alumina and chloroplatinic acid.
The invention further protects polyurethane foams prepared from foam-forming compositions comprising the above-described silicone surfactants.
Preferably, the polyurethane foam is a high resilience foam.
As a further improvement of the present invention, a diluent is further included, preferably, the diluent is selected from one or a mixture of several of acetone, methyl ethyl ketone, cyclohexanone, benzene, toluene, xylene, n-butanol, styrene, and isopropanol.
As a further improvement of the present invention, wherein the foam-forming composition further comprises at least one polyol, at least one isocyanate source, at least one polyurethane catalyst, and optionally at least one other component selected from the group consisting of: fillers, blowing agents, other polymers, chain extenders, crosslinking agents, reinforcing agents, colorants, flame retardants, antioxidants, antiozonants, UV stabilizers, antistatic agents, biocides, and biostabilizers.
As a further improvement of the invention, the polyol is selected from one or more of pentaerythritol, glycerol, trimethylolethane, xylitol, sorbitol, ethylene glycol, 1, 2-propanediol, 1, 4-butanediol, 1, 6-hexanediol, neopentyl glycol, diethylene glycol, dipropylene glycol and trimethylolpropane; the isocyanate source is selected from one or more of toluene diisocyanate, isophorone diisocyanate, diphenylmethane diisocyanate, dicyclohexylmethane diisocyanate, hexamethylene diisocyanate and lysine diisocyanate.
As a further improvement of the present invention, wherein the density of the foam is not less than 30Kg/m 3 The air permeability is not lower than 52.2cm 3 /cm 2 /s。
Mechanism of action: since the backbone of the silicone surfactant is a soft Si-O bond, it is neither hydrophilic nor oleophilic, and therefore can be used in aqueous solutions and in non-aqueous media where conventional hydrocarbon surfactants cannot be used. On the other hand, the silicone surfactant is arranged in a methyl group at the interface, and the force between the molecules of the silicone is much weaker than the hydrocarbon compound because the rotation of the methyl group occupies a larger space, thereby increasing the distance between adjacent silicone molecules, and the force between molecules is inversely proportional to the hexagonal direction of the distance between molecules. The surface tension of the siloxane is smaller than that of hydrocarbon with similar molar mass, so that the siloxane is easy to spread on an interface, in addition, oxygen in the siloxane can form a hydrogen bond with polar molecules or atomic groups, acting force between a siloxane chain and polar surface molecules is increased, the siloxane is promoted to spread into a monomolecular layer, and the hydrophobic siloxane is horizontally arranged on the polar surface and takes a special 'stretching chain' configuration. Therefore, the silicone surfactant can reduce the surface tension to about 20mN/m at the minimum. Compared with the traditional hydrocarbon surfactant, the silicone surfactant has super wettability because trisiloxane chains are distributed in an umbrella shape at the interface, can be spread on an oil/water interface more rapidly and the silicone chains are distributed more tightly at the water interface due to the flexibility of the silicone chains.
The invention has the following beneficial effects:
the organic silicon surfactant provided by the invention can form medium-high density polyurethane foam with finer and more uniform foam holes, so that the difference between upper and lower layers of polyurethane foam is reduced, the air permeability of the foam is improved, the foaming process is more stable, and the consistency of the quality of each layer of the product is improved. Meanwhile, the obtained medium-high density polyurethane foam has low closed porosity and is more breathable; the preparation method of the organic silicon surfactant added into the medium-high density polyurethane foam is simple and easy to implement, and the medium-high density polyurethane foam obtained by adding the organic silicon surfactant into polyurethane has small difference in air permeability between the upper layer and the lower layer, enhances the openness, and has good air permeability and good resilience.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.
FIG. 1 is a reaction scheme of a silicone surfactant of the present invention;
FIG. 2 is a reaction scheme of the silicone surfactant of example 1 of the present invention;
FIG. 3 is a reaction scheme of the silicone surfactant of example 2 of the present invention;
FIG. 4 is a reaction scheme of the silicone surfactant of example 3 of the present invention;
FIG. 5 is a graph showing the surface tension results of aqueous silicone surfactant solutions of different mass concentrations in examples 1-3 of test example 1 according to the present invention.
Detailed Description
The following description of the technical solutions in the embodiments of the present invention will be clear and complete, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
0.8% hydrogen-containing silicone oil, industrial product, omega not less than 98.0%, purchased from Zhejiang Runner organic silicon new material chemical industry Co.
Example 1 preparation of a Silicone surfactant
Referring to fig. 1 and 2, the method comprises the following steps:
s1, dissolving 1mol of polyethylene glycol 2000 and isopropyl titanate accounting for 0.2% of the total mass of the system in 200ml of LDMF, adding NaOH accounting for 1% of the total mass of the system, introducing nitrogen for protection, heating to 120 ℃, dropwise adding 2.1mol of 4-vinylbenzoic acid, reacting for 1h, filtering, washing with water, and distilling under reduced pressure to generate an intermediate II;
s2, dissolving 2.1mol of intermediate II and ethylenediamine accounting for 1% of the total mass of the system in 200mL of dichloromethane, adding a platinum catalyst accounting for 0.01% of the total mass of the system, adding 1mol of 3, 5-heptamethyltrisiloxane in batches, carrying out reflux reaction for 2 hours, distilling, and removing low molecular substances to obtain a product organosilicon surfactant with the yield of 90%;
the platinum catalyst in this example was platinum-carrying alumina, and the amount of platinum carried was 0.5wt%.
The obtained organosilicon surfactant is subjected to infrared spectrum test: 2875cm -1 at-CH 2 Is 1645cm -1 The peak of vibration absorption was c=o, 1572cm -1 And 1471cm -1 Is 1262cm of skeleton vibration absorption peak of benzene ring -1 At Si-CH 3 Is 1107cm -1 The overlapping peaks of C-O-C stretching vibration and Si-O-Si stretching vibration are 1465 cm and 1347cm -1 at-CH 3 Is 962cm -1 、924cm -1 And 860cm -1 Is an isolated hydrogen out-of-plane bending vibration absorption peak on the benzene ring.
Example 2 preparation of a Silicone surfactant
Referring to fig. 1 and 3, the method comprises the following steps:
s1, dissolving 1mol of polyethylene glycol 4000 and isopropyl titanate accounting for 0.5% of the total mass of a system in 200ml of LDMF, adding NaOH accounting for 2% of the total mass of the system, introducing nitrogen for protection, heating to 150 ℃, dropwise adding 2.5mol of 3-butenoic acid, reacting for 3 hours, filtering, washing with water, and distilling under reduced pressure to generate an intermediate II;
s2, dissolving 2.4mol of intermediate II and ethylenediamine accounting for 4% of the total mass of the system in 200mL of isopropanol, adding a platinum catalyst accounting for 0.1% of the total mass of the system, adding 1mol of 3, 5-heptamethyltrisiloxane in batches, carrying out reflux reaction for 5 hours, distilling, and removing low molecular substances to obtain a product organosilicon surfactant with the yield of 92%;
the platinum catalyst in this example is platinum black.
The obtained organosilicon surfactant is subjected to infrared spectrum test: 2870cm -1 at-CH 2 Is 129cm -1 At Si-CH 3 Is 1105cm -1 The overlapping peaks of C-O-C stretching vibration and Si-O-Si stretching vibration are 1467 cm and 1342cm -1 at-CH 3 Is a bending vibration absorption peak of (a).
Example 3 preparation of a Silicone surfactant
Referring to fig. 1 and 4, the method comprises the following steps:
s1, dissolving 1mol of polyethylene glycol 3000 and isopropyl titanate accounting for 0.35% of the total mass of the system in 200ml of LDMF, adding NaOH accounting for 1-2% of the total mass of the system, introducing nitrogen for protection, heating to 135 ℃, dropwise adding 2.3mol of 4-pentenoic acid, reacting for 2 hours, filtering, washing with water, and distilling under reduced pressure to generate an intermediate II;
s2, dissolving 2.3mol of intermediate II and ethylenediamine accounting for 2.5% of the total mass of the system in 200mL of dichloromethane, adding a platinum catalyst accounting for 0.05% of the total mass of the system, dropwise adding 1mol of 0.8% hydrogen-containing silicone oil, carrying out reflux reaction for 3.5h, distilling, and removing low molecular substances to obtain a product organosilicon surfactant, wherein the yield is 95%;
the platinum catalyst in this example is a platinum metal mesh.
Test example 1 surface tension measurement
A series of organosilicon surfactant aqueous solutions with different mass concentrations are prepared, then a JK99B full-automatic surface tension meter is adopted for measurement, and NaCl and MgCl with different mass fractions of the organosilicon surfactant of the example 3 are also measured 2 The effect on the surface tension of 1g/L of the aqueous silicone surfactant solution. The interfacial tension is measured by a TX500D spin-drop interfacial tension meter, the dynamic interfacial tension between crude oil and a surfactant aqueous solution is measured, the test temperature is 60 ℃, the test rotating speed is 6000r/min, the mass concentration of the surfactant is 2g/L, and the crude oil density is 0.91g/cm 3 。
The surface tension results for aqueous silicone surfactant solutions of different mass concentrations in examples 1-3 are shown in FIG. 2.
As can be seen from FIG. 2, the silicone surfactants prepared in examples 1-3 of the present invention can have excellent surface properties at a relatively low concentration (0.5 g/L) with a surface tension reduced to 21-25 mN/m.
The effect of different mass fractions of inorganic salts on surfactant surface tension results are shown in table 1.
TABLE 1
MgCl is added into the surfactant under the same mass concentration 2 After that, the surface tension thereof increases. Mainly due to Mg 2+ The breaking effect of (2) causing the water molecules bound to the oxygen atoms to fall off, the hydrogen bonds formed to be broken, the hydrophilicity of the water-soluble surfactant to be reduced, and the surface tension of the water-soluble surfactant to be reduced; at the same time, -CH 2 -O-CH 2 The lone pair electrons provided by the oxygen in the radical are readily available to Mg 2+ Crown ethers are formed such that the solubility of the surfactant in water increases, resulting in an increase in its surface activity. The result is a slight increase in the surface tension of the solution due to the combined effect of the destructive effect on hydrogen bonding and chelation. Wherein the damage effect of cations to hydrogen bonds is Mg 2+ ＞Na + . The reason is that MgCl is added into the solution 2 Thereafter, -CH 2 -O-CH 2 The hydrogen bond of the group with water is more easily broken, resulting in more-CH 2 -O-CH 2 -group and Mg 2+ Crown ether formation increases the solubility of the surfactant to a greater extent than Na + . From this, mgCl can be seen 2 The influence on the organosilicon surfactant is larger and the influence on NaCl is smaller. As can be seen from the above table, the surfactant prepared in example 3 was composed of NaCl and MgCl 2 Can still keep the surface energy low by adding.
Test example 2
The silicone surfactants described in examples 1-3 were used in varying amounts to prepare very medium to high density flexible board foams with the commercial silicone surfactants and the results are shown in Table 2.
TABLE 2
As is clear from the above table, the silicone surfactant examples 1 to 3 produced by the present invention can enhance the efficacy and improve the cell structure, and the use of the commercially available surfactant 580, respectively, is inferior to the surfactant examples 1 to 3 of the present invention in that many pinhole defects occur or cells are coarser in the medium-high density soft sheet foam, the air permeability is lowered, and the elasticity is deteriorated.
The polyurethane contains isocyanate structures, and isocyanate contains benzene ring structures, so that a technician often wants to synthesize a polysiliconic ether surfactant with benzene rings to improve the performance of the polysiliconic ether surfactant, and the difficulty of synthesizing the polysiliconic ether surfactant is very high, and almost no similar products are available on the market.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (9)
1. A polyurethane foam prepared from a foam-forming composition, wherein the foam composition comprises a silicone surfactant comprising a general formula as shown in any one of formulas i-ii;
wherein n=16-64, r=c1-3, ph, x=1-25, y=1-10, z=0-20;
the preparation method of the organic silicon surfactant comprises the following steps:
s1, reacting polyethylene glycol with end group alkenecarboxylic acid to generate an intermediate III with the structure of
The terminal alkenecarboxylic acid is selected from one of 4-vinylbenzoic acid, 3-butenoic acid, 4-pentenoic acid and 5-hexenoic acid;
s2, reacting the intermediate III with hydrogen-containing siloxane to generate a product organosilicon surfactant;
the hydrogen-containing siloxane is selected from one of double-end hydrogen-containing silicone oil and low hydrogen-containing silicone oil, and the double-end hydrogen-containing silicone oil has a structure shown in a formula IV:
wherein x=1 to 25;
the low-hydrogen silicone oil has a structure shown in the formula V:
where z=0-20 and y=1-10.
2. The polyurethane foam prepared from the foam-forming composition according to claim 1, wherein the amounts of polyethylene glycol and terminal alkenecarboxylic acid materials in step S1 are prepared as 1: (2.1-2.5); the molecular weight of the polyethylene glycol is between 1000 and 4000.
3. Polyurethane foam obtainable from a foam-forming composition according to claim 1, characterized in that the ratio of the amount of intermediate iii to the amount of hydrogen-containing siloxane in step S2 is (2.1-2.4): 1.
4. polyurethane foam obtainable from a foam-forming composition according to claim 1, characterized in that it comprises the following steps:
s1, dissolving 1mol of polyethylene glycol and 0.2-0.5% of isopropyl titanate accounting for the total mass of the system in 200mL of DMF, adding 1-2% of NaOH accounting for the total mass of the system, introducing nitrogen for protection, heating to 120-150 ℃, dropwise adding 2.1-2.5mol of end group alkenecarboxylic acid, reacting for 1-3h, filtering, washing with water, and distilling under reduced pressure to obtain an intermediate III;
s2, dissolving 2.1-2.4mol of intermediate III and 1-4% of ethylenediamine accounting for the total mass of the system in 200mL of dichloromethane, adding 0.01-0.1% of platinum catalyst accounting for the total mass of the system, adding 1mol of hydrogen-containing siloxane in batches, carrying out reflux reaction for 2-5h, filtering, washing with water, and washing with ethanol to obtain the organosilicon surfactant;
the platinum catalyst is a platinum metal net, platinum black or platinum-carrying alumina.
5. The polyurethane foam prepared from the foam-forming composition according to claim 1, wherein the foam-forming composition further comprises a diluent.
6. The polyurethane foam produced from the foam-forming composition according to claim 5, wherein the diluent is selected from one or a mixture of several of acetone, methyl ethyl ketone, cyclohexanone, benzene, toluene, xylene, n-butanol, styrene.
7. The polyurethane foam prepared from the foam-forming composition according to claim 1, wherein the foam-forming composition further comprises at least one polyol, at least one isocyanate source, at least one polyurethane catalyst, and at least one other component selected from the group consisting of: fillers, blowing agents, other polymers, chain extenders, crosslinking agents, reinforcing agents, colorants, flame retardants, antioxidants, antiozonants, UV stabilizers, antistatic agents, biocides, and biostabilizers.
8. The polyurethane foam prepared from the foam-forming composition according to claim 7, wherein the polyol is selected from one or more of pentaerythritol, glycerol, trimethylolethane, xylitol, sorbitol, ethylene glycol, 1, 2-propanediol, 1, 4-butanediol, 1, 6-hexanediol, neopentyl glycol, diethylene glycol, dipropylene glycol, trimethylolpropane; the isocyanate source is selected from one or more of toluene diisocyanate, isophorone diisocyanate, diphenylmethane diisocyanate, dicyclohexylmethane diisocyanate, hexamethylene diisocyanate and lysine diisocyanate.
9. The polyurethane foam produced from the foam-forming composition according to claim 1, wherein the density of the foam is not less than 30Kg/m 3 The air permeability is not lower than 52.2cm 3 /cm 2 /s。
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